I have extensive experience with Salesforce, having worked on multiple projects involving custom development and integration. For QA automation, I've primarily used Salesforce's own tools like Apex, Visualforce, and Lightning components. Additionally, I've integrated third-party tools such as Selenium and TestNG for end-to-end testing, and I've also utilized Salesforce DX for continuous integration and deployment.

When testing complex Salesforce workflows, I first break down the workflows into smaller, manageable components. I then create detailed test cases for each component, ensuring comprehensive coverage. For integrations, I use tools like Postman to simulate API calls and validate responses. I also set up automated monitoring to detect any discrepancies in real-time data flow between systems.

To ensure reliability, I focus on writing modular and reusable test scripts that can be easily maintained. I also implement continuous integration pipelines to run tests automatically with every code change. For scalability, I use parallel testing frameworks like Selenium Grid to distribute tests across multiple environments, reducing execution time and improving efficiency.

One challenging bug I encountered involved a discrepancy in data synchronization between Salesforce and an external database. After thorough debugging, I discovered that the issue was due to a misconfiguration in the data mapping rules. I resolved it by reconfiguring the mappings and adding additional validation checks in the integration layer to ensure data consistency.

I stay updated by regularly attending Salesforce webinars, participating in online forums, and following industry blogs and publications. I also engage with the Salesforce developer community through platforms like Trailhead and GitHub. Additionally, I continuously seek out training opportunities and certifications to enhance my skills and knowledge.